Hewitt University Quadrangle, commonly known as Beinecke Plaza, is a plaza at the center of the Yale University campus in New Haven, Connecticut. It is the home of the university's administration, main auditorium, and dining facilities. The quadrangle was created with the construction of the university's Bicentennial Buildings and Woodbridge Hall in 1901. Until 1917, it was known as University Court. The completion of the Beinecke Library created subterranean library facilities beneath the courtyard, establishing the present appearance of the paved plaza and sunken courtyard.

The Rotunda, with tablets on the walls commemorating Yale's war dead is a double-sized, domed, colonnaded version of Bramante's Tempietto built in 1502 on the site of St. Peter's martyrdom in Rome. Above the memorial is the President's Room, used for donor and ceremonial receptions.

Before the colonnade of the Commons is a memorial cenotaph. Its inscription reads:

In Memory of the Men of Yale who true to Her Traditions gave their Lives that Freedom might not perish from the Earth. 1914 Anno Domini 1918.

Behind the cenotaph, one can see inscribed the names of World War I battles of Cambrai, Argonne, Somme, Chateau-Thierry, Ypres, St. Mihiel and Marne. Woodbridge Hall, located on the west side of the plaza, was designed by the firm of Howells & Stokes and is French Renaissance in style. It contains the central administration of the University. The building was named for Reverend Timothy Woodbridge, one of the founders of Yale College.

The Beinecke Library's sunken courtyard, visible but not accessible from the plaza, contains Isamu Noguchi's sculpture The Garden (Pyramid, Sun, and Cube). The three marble sculptures represent time, the sun, and chance. Alexander Calder's sculpture Gallows and Lollipops stands on the plaza. The Claes Oldenburg sculpture Lipstick Ascending on a Caterpillar Tread (now located in Morse College) was once on the plaza.

As the symbolic heart of the university—and as the space in front of the administration building—Beinecke Plaza is occasionally the site of rallies and protests. These have included labor rallies held by the Federation of Hospital and University Employees and their supporters. Student protests have included a 16-day occupation of the plaza by Students Against Sweatshops in support of an ethical licensing policy (spring 2002). Most notable was the 1986 construction of a shanty-town erected to demand Yale's divestment from apartheidSouth Africa. After students erected the shanty-town, designed to mimic a Soweto shanty and named after Winnie Mandela, the university administration ordered its removal and demolished it. The destruction of the shanty-town, which required the arrest of dozens of protesters, unleashed an outpouring of anger and demands that the shanty-town be recreated. Eventually the university relented and the town was resurrected, only to be burned down by an irate alumnus two years later and replaced by a "memorial wall".